If the chain guard stud has punched through the gear case, how much distance would the stud tip have, before it comes into contact with internal components?  I have found a 1/4 “ 24 tpi stud, 1 1/2  inch in length, which suits the case thread.  

When screwed in, it bottoms out, where a 1/2 inch length, of the stud, remains exposed and visible, when viewed from the outside of the case.  I now need to know, if that point where it bottoms out, is the gear casing, or an internal gearbox component.  A rotating gear perhaps ?